The standard socket size for the 5.7 HEMI oil drain plug is 14mm, which is the typical hex head on Mopar 5.7 engines. Some variations or aftermarket plugs may use a 13mm head, so verify before forcing a socket.
Identifying the correct size for your engine
On most factory 5.7 HEMI engines, the oil drain plug has a 14mm hex head. Some aftermarket or older plugs may use a 13mm head, so it’s a good idea to try 14mm first and then 13mm if 14mm doesn’t engage properly. Avoid using pliers or adjustable wrenches that could round off the head.
- 14mm hex head — standard on the majority of factory engines, compatible with most 14mm sockets (6-point or 12-point).
- 13mm hex head — occasionally found on some aftermarket drains or older Mopar configurations; may require a 13mm socket.
Understanding the exact plug type helps speed up maintenance and prevents damage to the plug or oil pan threads.
Practical steps for changing the oil drain plug
- Prepare the tools: a 14mm socket in a drive size that fits your clearance, plus a drain pan and rags.
- With the engine cool and the vehicle safely supported, place the pan under the drain plug.
- Loosen the drain plug with the 14mm socket, allowing oil to drain completely.
- Remove the plug, inspect the crush washer or gasket; replace if necessary, and reinstall the plug by hand to avoid cross-threading.
- Tighten to the manufacturer’s torque specification (found in the vehicle service manual). Avoid over-tightening that could strip the threads.
- Refill with the recommended oil, then check for leaks after starting the engine and running briefly.
For best results, consult your owner's manual or service manual for the exact torque value and washer recommendations for your model year and engine variant.
Summary
In short, start with a 14mm socket for most 5.7 HEMI oil drain plugs. If 14mm does not fit, try a 13mm only with caution. Always verify with the manual and replace any worn washer; adhere to torque specs to prevent damage.
Are all oil drain plugs 14mm?
Most cars use oil drain plugs between 13mm and 17mm, depending on the brand. For example, Toyota and Honda typically use 14mm or 17mm, while Ford often uses 13mm or 15mm. Using a universal drain plug socket set like the BILITOOLS 23-Piece Kit ensures you always have the right size on hand.
What is the best brand of oil for my RAM 1500?
Mopar
RAM recommends its Mopar brand of oil, called MaxPro, for your RAM 1500. Mopar meets RAM's high standards for quality to keep your engine in top condition for as long as you own your truck.
What size RAM 1500 HEMI oil drain plug?
13 mm
Dorman – Standard Engine Oil Drain Plug: M14-1.50 Thread, 13 mm Head, 1 Pack (Part No. 090-938CD)
What size socket is the drain plug on a 5.7 HEMI?
13-millimeter socket
Using a 13-millimeter socket and torque wrench, tighten the drain plug.